Some random fixes

* General: Small fixes (indentation, typos, clean-up of code)
* ltrace.c: Close output file on exit
* ltrace.c: use getenf("HOME") instead of getpwuid(geteuid())->pw_dir
* read_config_file.c, display_args.c: remove "ignore" argtype;
  that's what "void" is for
* packaging/debian/: misc fixes, sync with version 0.5-1
* etc/ltrace.conf: added more system calls
* testsuite/ltrace.minor/trace-clone.c: sleep(1) to avoid earlier
  termination of process
* sysdeps/linux-gnu/trace.c: trace_pid(): reverted Petr's patch
  to wait for child to stop, as it stopped following clone()
* process_event.c: Disable breakpoints before doing fork() (again!),
  to make children work as expected
diff --git a/options.h b/options.h
index 9ead6f3..da5c5aa 100644
--- a/options.h
+++ b/options.h
@@ -21,6 +21,7 @@
 extern int opt_C;		/* Demanglelow-level symbol names into user-level names */
 extern int opt_n;		/* indent trace output according to program flow */
 extern int opt_T;		/* show the time spent inside each call */
+extern int opt_o;		/* output to a specific file */
 
 struct opt_p_t {
 	pid_t pid;